import { JWTService, TokenPayload } from '../../../src/Application/Services/JWTService';
import { Request, Response } from 'express';
import { UserState } from '../../../src/Domain/User/UserAggregate';


describe('JWTService', () => {
  let jwtService: JWTService;
  let mockRequest: Partial<Request>;
  let mockResponse: Partial<Response>;

  beforeEach(() => {
    jest.clearAllMocks();
    jwtService = new JWTService();
    
    // Set a test secret for consistent testing
    process.env.JWT_SECRET = 'test-secret-key-for-testing';
    process.env.JWT_EXPIRY = '3600'; // 1 hour
    
    // Mock express Request and Response
    mockRequest = {
      cookies: {}
    };
    
    mockResponse = {
      cookie: jest.fn()
    };
  });

  afterEach(() => {
    // Clean up environment
    delete process.env.JWT_SECRET;
    delete process.env.JWT_EXPIRY;
  });

  describe('create', () => {
    it('should create a valid JWT token and set cookie', () => {
      // Arrange
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };

      // Act
      const token = jwtService.create(payload, mockResponse as Response);

      // Assert
      expect(token).toBeDefined();
      expect(typeof token).toBe('string');
      expect(token.split('.')).toHaveLength(3); // JWT has 3 parts
      expect(mockResponse.cookie).toHaveBeenCalledWith(
        'auth_token',
        token,
        expect.objectContaining({
          httpOnly: true,
          sameSite: 'strict',
          maxAge: 86400000 // 24 hours in milliseconds
        })
      );
    });

    it('should create different tokens for different payloads', () => {
      // Arrange
      const payload1: TokenPayload = {
        userId: 'user-1',
        authLevel: 0 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-1'
      };
      
      const payload2: TokenPayload = {
        userId: 'user-2',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_PREMIUM,
        orgId: 'org-2'
      };

      // Act
      const token1 = jwtService.create(payload1, mockResponse as Response);
      const token2 = jwtService.create(payload2, mockResponse as Response);

      // Assert
      expect(token1).toBeDefined();
      expect(token2).toBeDefined();
      expect(token1).not.toBe(token2);
    });

    it('should set secure cookie in production environment', () => {
      // Arrange
      process.env.NODE_ENV = 'production';
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };

      // Act
      const token = jwtService.create(payload, mockResponse as Response);

      // Assert
      expect(mockResponse.cookie).toHaveBeenCalledWith(
        'auth_token',
        token,
        expect.objectContaining({
          secure: true
        })
      );
      
      // Clean up
      delete process.env.NODE_ENV;
    });
  });

  describe('verify', () => {
    it('should verify a valid token from cookies', () => {
      // Arrange
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };
      
      const token = jwtService.create(payload, mockResponse as Response);
      mockRequest.cookies = { auth_token: token };

      // Act
      const result = jwtService.verify(mockRequest as Request);

      // Assert
      expect(result).toBeDefined();
      expect(result!.userId).toBe('user-123');
      expect(result!.authLevel).toBe(1);
      expect(result!.orgId).toBe('org-456');
    });

    it('should return null when no token is present in cookies', () => {
      // Arrange
      mockRequest.cookies = {};

      // Act
      const result = jwtService.verify(mockRequest as Request);

      // Assert
      expect(result).toBeNull();
    });

    it('should return null for invalid token', () => {
      // Arrange
      mockRequest.cookies = { auth_token: 'invalid.jwt.token' };

      // Act
      const result = jwtService.verify(mockRequest as Request);

      // Assert
      expect(result).toBeNull();
    });

    it('should return null for malformed token', () => {
      // Arrange
      mockRequest.cookies = { auth_token: 'not-a-jwt-token' };

      // Act
      const result = jwtService.verify(mockRequest as Request);

      // Assert
      expect(result).toBeNull();
    });
  });

  describe('token creation with different payloads', () => {
    it('should create tokens with dynamic user data', () => {
      // Arrange
      const timestamp = Date.now();
      const testPayload: TokenPayload = {
        userId: `test-user-${timestamp}`,
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: `test-org-${timestamp}`
      };

      // Act
      const token = jwtService.create(testPayload, mockResponse as Response);

      // Assert
      expect(token).toBeDefined();
      expect(typeof token).toBe('string');
      expect(mockResponse.cookie).toHaveBeenCalled();
      
      // Verify we can decode it back
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = jwtService.verify(mockRequest as Request);
      
      expect(verifiedPayload).toBeDefined();
      expect(verifiedPayload!.userId).toBe(testPayload.userId);
      expect(verifiedPayload!.orgId).toBe(testPayload.orgId);
      expect(verifiedPayload!.authLevel).toBe(testPayload.authLevel);
    });

    it('should create different tokens for different timestamps', async () => {
      // Arrange
      const timestamp1 = Date.now();
      const payload1: TokenPayload = {
        userId: `test-user-${timestamp1}`,
        authLevel: 0 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: `test-org-${timestamp1}`
      };
      
      // Add a small delay to ensure different timestamps
      await new Promise(resolve => setTimeout(resolve, 1));
      
      const timestamp2 = Date.now();
      const payload2: TokenPayload = {
        userId: `test-user-${timestamp2}`,
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_PREMIUM,
        orgId: `test-org-${timestamp2}`
      };

      // Act
      const token1 = jwtService.create(payload1, mockResponse as Response);
      const token2 = jwtService.create(payload2, mockResponse as Response);

      // Assert
      expect(token1).not.toBe(token2);
      expect(payload1.userId).not.toBe(payload2.userId);
      expect(payload1.orgId).not.toBe(payload2.orgId);
    });
  });

  describe('integration scenarios', () => {
    it('should create and verify token in complete flow', () => {
      // Arrange
      const originalPayload: TokenPayload = {
        userId: 'integration-user',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'integration-org'
      };

      // Act - Complete flow
      const token = jwtService.create(originalPayload, mockResponse as Response);
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = jwtService.verify(mockRequest as Request);

      // Assert
      expect(token).toBeDefined();
      expect(verifiedPayload).toBeDefined();
      expect(verifiedPayload!.userId).toBe('integration-user');
      expect(verifiedPayload!.authLevel).toBe(1);
      expect(verifiedPayload!.orgId).toBe('integration-org');
    });
  });

  describe('JWT_EXPIRATION duration parsing', () => {
    it('should parse JWT_EXPIRATION in hours format', () => {
      // Arrange
      delete process.env.JWT_EXPIRY;
      process.env.JWT_EXPIRATION = '2h';

      // Act
      const newJwtService = new JWTService();
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };
      
      const token = newJwtService.create(payload, mockResponse as Response);
      
      // Update mock request with the created token
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = newJwtService.verify(mockRequest as Request);

      // Assert
      expect(token).toBeDefined();
      expect(verifiedPayload).toBeDefined();
      expect(verifiedPayload!.exp).toBeDefined();
      
      // Token should expire in approximately 2 hours (7200 seconds)
      const expectedExp = Math.floor(Date.now() / 1000) + 7200;
      expect(verifiedPayload!.exp).toBeCloseTo(expectedExp, -1); // Within 10 seconds
      
      // Cleanup
      delete process.env.JWT_EXPIRATION;
    });

    it('should parse JWT_EXPIRATION in days format', () => {
      // Arrange
      delete process.env.JWT_EXPIRY;
      process.env.JWT_EXPIRATION = '7d';

      // Act
      const newJwtService = new JWTService();
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };
      
      const token = newJwtService.create(payload, mockResponse as Response);
      
      // Update mock request with the created token
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = newJwtService.verify(mockRequest as Request);

      // Assert
      expect(token).toBeDefined();
      expect(verifiedPayload).toBeDefined();
      
      // Token should expire in approximately 7 days (604800 seconds)
      const expectedExp = Math.floor(Date.now() / 1000) + 604800;
      expect(verifiedPayload!.exp).toBeCloseTo(expectedExp, -1); // Within 10 seconds
      
      // Cleanup
      delete process.env.JWT_EXPIRATION;
    });

    it('should parse JWT_EXPIRATION in minutes format', () => {
      // Arrange
      delete process.env.JWT_EXPIRY;
      process.env.JWT_EXPIRATION = '30m';

      // Act
      const newJwtService = new JWTService();
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };
      
      const token = newJwtService.create(payload, mockResponse as Response);
      
      // Update mock request with the created token
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = newJwtService.verify(mockRequest as Request);

      // Assert
      expect(token).toBeDefined();
      expect(verifiedPayload).toBeDefined();
      
      // Token should expire in approximately 30 minutes (1800 seconds)
      const expectedExp = Math.floor(Date.now() / 1000) + 1800;
      expect(verifiedPayload!.exp).toBeCloseTo(expectedExp, -1); // Within 10 seconds
      
      // Cleanup
      delete process.env.JWT_EXPIRATION;
    });

    it('should prioritize JWT_EXPIRY over JWT_EXPIRATION when both are set', () => {
      // Arrange
      process.env.JWT_EXPIRY = '1800'; // 30 minutes in seconds
      process.env.JWT_EXPIRATION = '1h'; // 1 hour

      // Act
      const newJwtService = new JWTService();
      const payload: TokenPayload = {
        userId: 'user-123',
        authLevel: 1 as const,
        userStatus: UserState.VERIFIED_REGULAR,
        orgId: 'org-456'
      };
      
      const token = newJwtService.create(payload, mockResponse as Response);
      
      // Update mock request with the created token
      mockRequest.cookies = { auth_token: token };
      const verifiedPayload = newJwtService.verify(mockRequest as Request);

      // Assert
      expect(token).toBeDefined();
      expect(verifiedPayload).toBeDefined();
      
      // Should use JWT_EXPIRY (1800 seconds), not JWT_EXPIRATION (3600 seconds)
      const expectedExp = Math.floor(Date.now() / 1000) + 1800;
      expect(verifiedPayload!.exp).toBeCloseTo(expectedExp, -1); // Within 10 seconds
      
      // Cleanup
      delete process.env.JWT_EXPIRY;
      delete process.env.JWT_EXPIRATION;
    });

    it('should throw error for invalid JWT_EXPIRATION format', () => {
      // Arrange
      delete process.env.JWT_EXPIRY;
      process.env.JWT_EXPIRATION = 'invalid-format';

      // Act & Assert
      expect(() => {
        new JWTService();
      }).toThrow('Invalid duration format: invalid-format. Use format like \'24h\', \'7d\', \'30m\'');
      
      // Cleanup
      delete process.env.JWT_EXPIRATION;
    });
  });
});